Pump system



Aug. 28, 1928. 1,682,331

C. H. GOYNE ET AL PUMP SYSTEM Fied-QecJZll. 1925 3 Sheets-Sheet l Aug.28, 1928. 1,682,331

c. H. GoYNE ET AL PUMP SYS TEM Filed Dec. 24. 1925 3 Sheets-Sheet 2 @Mwf l f. A I wouw/1j 3 Sheets-Sheet 3 fpm 0 m5 @mw n n ha C. H. GOYNE ETAL PUMP SYSTEM Filed Dec. 24, 1925 Aug. 28, 1928a Patented Aug. 28,1928.

UNITED STATES CHARLES H. GOYNE, JOHN G. GOYNE, ALBERT F. GOYNE, AND JOHNE.

OF ASHLAND, PENNSYLVANIA, ASSIGNORS TO GOYNE STEAM PUMP 1,682,331 PATENTQFFICE.

DOUGHERTY, COMPANY, or

ASHLAND, PENNSYLVANIA, A CORPORATION 0F PENNSYLVANIA.

PUMP sYs'rEM.

Application led December 24, 1925. Serial No. 77,490.

This invention relates to pump systems and more particularly to pumpsystems employing a centrifugal pump and a priming pump therefor.

An important object of the invention is the production of a system ofthis character which will be entirely automatic in its o eration andwhich is accordingly suitab e for use in pumping mine sumps and the likewithout requiring the services of an attendant.

A further and more specific object of the invention is to providel anautomatic pump system wherein the pump in its operation is automaticallyprimed and started and in event of its failure to produce a workingpressure after such priming and starting, stops, is reprimed andrestarted in further attempts to produce a working pressure.

It is additionally an object to provide means whereby upon failure ofthe pump to operate after a predetermined number of attempts to startthe same, the pump is automatically prevented from restarting, thuspreventing undue strain upon the pump due to such starting and stoppingoperations.

A further obj ect of the invention is to provide means for automaticallystopping the pump in event any of the bearings of either the motor orthe pump become overheated.

A further object of the invention is to provide in combination with amotor operated centrifugal pump a circuit controlling the operation ofthe motor including a switch and means for temporarily closing theswitch when the pump is primed together with a means for locking theswitch in its closed position, when the motor has been started and thecentrifugal has generated working pressure.

We have found that in the automatic operation of centrifugal pumps,there are a number of factors of operation which must be considered. Acentrifugal pump after priming, if the priming fluid contain a largepercentage of air, may be started and generate absolutely no pressure orit may generate a pressure of, for example, one hundred and forty-fivepounds where the actual working pressure of the pump is two hundredpounds. Accordingly, an important object of this invention is to providea system which stops the operation of the centrifugal after a primingand starting thereof whenever the generated pressure is less than theactual working pressure of the ump.

Under some circumstances, it 1s desirable to operate centrifugal pumpswith synchronous motors, which must be brought up to synchronous speedbefore applying the working load. Accordingly, a further ob'ect of theV.invention is to provide means for ully primmg the centrifugal pump,bringing the synchronous motor to synchronous speed, and thentransmitting motor operation to primed centrifugal pump.

A further object of the invention is the provision in a pump systememploying a motor operated centrifugal pump and a suct1on priming pumpfor the centrifugal, a suction operated switch controllin the operationof the motor and means 01' transferring the suction of the priming pumpfrom the centrifugal to said means when the centrifugal has been primed.

A furt-her and important object of the invention is to provide in apriming system of centrifugal pumps of that type wherein the cycle ofoperations of priming and startin the centrifugal is continued throughseveragl, trys in an attempt to bring the centrifugal to workingpressure, a construction whereby the priming pump may be continuouslyoperated `during these attempts, thus doing away with the shocks andjars to which the priming pump is ordinarily subjected in starting thesame. It is here pointed out that the ordinary type of priming pumpemployed with such devices is a suction pump operated from a motor andhaving a chain drive connection therewith. The motor, being started, isusually thrown directly across the service line with the result that itpractically instantaneously jumps to top speed, placing considerablestrain upon the priming pump. This renders it necessary that the primingpump be given frequent attention to assure its being kept in workingcondition and consequently detracts from the value of the usualautomatic system which otherwise requires little, if any, attention.

These and other objects we attain by the construction shown in theaccompanying drawings, wherein for the purpose of illustration is showna preferred embodiment of our invention and wherein Figure 1 is a viewpartially diagrammatic lOh of a pumping system constructed in accordancewith our invention;

Figure 2 is an enlarged fragmentary diagram showin a slightly differentcontrol circuit for sync ronous motors in which thermostatic switchesare employed and the motor is, stopped by the sump switch:

Figure 3 is an enlarged View partially 1n section of the try limitingmechanism,

Figure 4 is van enlarged detail sectional View of the float chamber andthe associated mechanism;

Figure 5 is an enlarged detall sectional view taken through the valvecontrolling communication with the vacuum operated switch control. l

Referring now more particularly to th drawings, the numberal generallydesignates a centrifugal pump operated from a motor 11. This motor maybe directly connected to the pump, as indicated at 12 in Figure 1, ormay be connected to the pump through a magnetic clutch 12, as indicatedin Figure 2. A. control circuit CC for the motor is provided andincludes a motor starting solenoid switch 13, the circuit of which, asdisclosed in Figure 1, includes a vacuum operated switch 14 openlng thecircuit upon the formation of an excessive vacuum in the suction pipe 15of the centrifu al and a further switch 16, the purpose o? which willhereinafter appear.

In the form shown in Figure 2, the motor circuit CC includes a sumpswitch 17 opened and closed by the level of water in a slump 18 and aplurality of thermostatically controlled switches 19 of which there isone for each of the bearings 2() of the centrifugal and bearings 21 ofthe motor. These last named switches open the circuit in event ofexcessive heating of any of the bearings or 21, thus preventing burningout thereof.

The numeral 22 generally designates a priming pump and 23 an operatingmotor therefor, the service line 24 of which includes a normally opensolenoid operated switch 25. A control circuit 26 for the motor 23 isr0- vided including the solenoid winding 2 of the solenoid operatedswitch 25, one contact 28 and the blade of a double-throw switch 29, anormally closed pressure operated switch 30 and the sump switch 17hereinbefore mentioned. The intake 31 of the suction pump 22 isconnected intermediate the ends of a vertical riser 32 having at itslower end a check valve 33 and communicatin at its upper end with theexhaust 34 of a oat chamber F through a-conduit 35. This iloat chamberhas its intake connected by a conf duit 36 with the high point of thecentrifugal pump. VIn the present illustration, the

pump is disclosed as a two stage centrifugal and the conduit 36communicates with the high point of the cross-over 37 connecting thestages. The remaining high points of Leeaasi the pump are connected withthe conduit 36, as indicated at 38, a check valve 39 of any suitabletype being arranged in the connection so that communication between thehigher and lower stages of the pump is prevented when the pump is inoperation.

The float chamber includes guides 40 and 41, the guide 40 receiving atail stem 42 upon a ioat ball 43 while the guide 41 recieves the usualwing guides formed upon the stem 44 of a check valve 45 carried by theball. While the above check valve structure has been illustrated, itwill, of course, be understood that any type of iioat controlled checkmay be employed where this is found desirable.

The switch 16 has associated therewith a f cylinder 46 having a piston47 therein. The

upper end of this cylinder is connected through a conduit 48 with theexhaust port 34 of the float chamber, a check valve 49 being arranged insaid connection and closing toward the. exhaust port. This check valvehas a stem 50 arranged in the path 'of movement of the stem 44 of thefloat controlled check valve 45 to be engaged thereby as the floatoperated check valve is seated whereby the check valve 49 opens -as thecheck valve 45 closes, placing the upper end of the cylinder 46 incommunication with the suction pump, whenever the float valve 45 isclosed.

The stem 51 of the piston 47 has attached thereto the piston 52'of adash-pot cylinder 53 which is loosely directed through the lower wall ofthe cylinder 46. This stem has arranged thereon spaced stops 54, 55, andis adapted, as at 56, for the support of counterweights 57 constantlyurging the piston 47 and 52 toward the lower end of the cylinders. Themovement of the piston to the lower end of the cylinder after it hasonce been elevated is resisted by air cushioning beneath the pistonofthe dashpot and this air slowly leaking from the dashpot together withthe counterweights determines the speed with which the pistonpreturns toits lowermost position. The switch 16 has an operating arm 58 extendedbetween the stops 54 and 55 and as the piston lselevated upon thecreation of a vacuum in the upper end of the cylinder, the stop 55 willengage this arm and close the switch while as the piston lowers underthe iniiuence of the counterweights, the stop 54 will en age this armand open the switch.

t will, of course, be obvious that in order to permit this piston tolower, communication between the cylinder 46 and the vacuum pump must bediscontinued. For this reason, we arrange in the conduit 48 a valve 59,the operating arm of which has a counterweight 61 moving the valvequickly to either open or closed positions after the operating arm hasbeen moved a predelili lll.

termined distance. The stop 54 is elongated to provide an arm 54 whichcoacts with the lower end of the stem 62 of the piston 63 of a dash-pot64. The upper end of this stem has a pair of spacedstops and 66 betweenwhich the o erating arm 60 of the valve 59 extends. T e dash-pots 53 and64 operate at different speeds, the piston of the dashpot 53 settlingmore rapidly than the piston of the dash-pot 64. Vhen the piston 47elevates, this elevation will cause elevation of the dash-potpiston 63and closing of the valve 59, thereby cutting off communication betweenthe vacuum pump and the cylinder, even though the valve 49 be open.

Any suitable means may be provided for breaking the vacuum of thecylinder 46 when this valve is closed. This means may be included in thevalve 59 and in the present instance is shown as a conduit 67 formed inthe rotating element of the valve communicating at one end with theatmos i here and aligning at its opposite end wit the bore of thatportion o the conduit 48 communicating with the cylinder 46 when thevalve 59 is in its closed position. The switch employed will be of suchcharacter that after the switch is in its closed position, an additionalmovement of the arm 58, in the same direction as its movement in closingthe switch, may be had without affecting the position of the switch, fora purpose presently to appear.

A pressure cylinder 68 is rovided having a piston 69 arranged therein.The lower end of the cylinder is in communication with the interior ofthe pump and accordingly subject to the pressure therein through aconduit 70. The stem of the piston, indicated at 71, supports a switchelement 72 of the switch 30 and the extremity of the arm 58 projectsover this switch element and into the path of movement thereof. The arm58 may elevate independently of the element 72 but when it is in itsraised position, if the element elevates in response to a predeterminedressure generated within the centrifugal, t e arm is moved to and heldin a. slightly higher position and the switch 16 is maintained in itsclosed position. The piston 69 also serves as a means for opening theswitch 30 of the priming pump motor control circuit 26 and thus servesthe dual functions of stopping the priming pump and maintaining t econtrol circuit CC of the motor of the centrifugal.

The operation of the mechanism hereinbefore described is as followsz-Assuming the sump switch 17 to be closed and that there is no pressurewithin the centrifugal, the priming pump motor control circuit 26 iscompleted at the switches 30 and 29 and the riming pump is started. Thesection of t e priming pum draws fluid from the sump 18 into and t roughthe centrifugal until this fluid reaches the float chamber, causing thefloat 43 to elevate and the check valve 45 controlled by this ioat toclose. The closure of the check valve 45 causes opening of the valve 49with the resultvthat the suction of the priming pump is transferred fromthe centrifugal to the cylinder 46. This causes elevation of the piston47 and its stem with the result that the switch 16 is closed. At thesame time, the valve 59 is closed and the vacuum of t-he cylinder 46broken, permitting the piston to slowly recede under the influence ofits counterwe ghts against the action of the dashpot 53. The timerequired for this piston to recede sufficiently to permit the stop 54 toengage with the arm 58 and open the switch 16 will be sufiicient topermit the motor 11 to come to operating speed vand the centrifugal 10to generate working pressure.

The closure of the switch 16 closes the control circuit CC of the motorand this motor is started in an attempt to generate working pressure. Ifthe prime is faulty or for any reason the centrifugal failed to generateworking pressure, the piston 69 of the pressure cylinder will remainsta,- tionary with the result that there is nothing to interfere withmovement of the switch 16 to its Iopen position. When the switch 16 ismoved to its open position, the control circuit of the motor 11 isopened and the centrifugal stopped, permitting the priming fluid torecede and the float 43 to withdraw the check valve 45 from its seat, itbeing understood that this ball and its associated parts has sufficientweight either of itself or through associated leverage to cause thiswithdrawal of the check valve against the vacuum produced by the vacuumpump. This permits the vacuum of the vacuum pump to be again applied todraw fluid rom the sump18 through the centrifugal in a repeated attemptto prime the same and the above cycle of operations is repeated unlessthe centrifugal generates working pressure.

In some instances, the pressure generated is less than working pressureand under these circumstances, a pressure will be maintained until themotor 11 has completely stopped. It will, of course, be understood thatthis motor, when starting under the influence of the switch 16, willattain a predetermined speed and that as this speed is necessarily highwhen the circuit is broken, operation of the centrifugal will continuefor a short period. This pressure may cause the iioat check 45 to remainagainst its seat in which levent the valve 49 would be open andaccordingly the vacuum pump would immediately again c-lose the switch'16 unless the mechanism operating the valve 59 were such that this valvedid not open until after the centrifugal had ceased to operate andaccordingly all pressure had been removedfrom the liioat and check valve45. The dash-pot 64,

however, since it does not operate as rapidly as the dash-pot 53, doesnot bring its stop into operating engagement with the arm of the valve59 until the switch 16 has been open for a predetermined period, thusgivinethe motor time to stop' and all pressure to dispersed before thevalve is re-opened. Since the float 48 will drop as soon as pressure isrelieved, it follows that the Avalve 49 will be closed and the suctionfrom the pump will be first directed through the centrifugal to primethe same and then to the cylinder 46 in the order above described. Aswill hereinafter appear, other means may' be provided for insuringopening of the check 45 and closing of the check 49, if so desired. Ifthe centrifugal generatesworking pressure, this pressure is transmittedto the piston 69, causing the same to elevate with the result thattheelement 72 will prevent lowering movement of the arm 58 and accordino'lyprevent opening of the switch 16 and thereby maintain the controlcircuit CC closed until this pressurev drops below such workingpressure. Operation of the piston 69 under the inuence of workingpressure likewise opens the control circuit 26 of the priming pump motorat the switch 3() so that the priming pump is stopped. It will beobvious that during operation of the priming pump, the check valve 33will be maintained in closed position and it will also be obvious thatany water whichmay pass the check 45 will collect within the lower endof the vertical le 32 above this valve. Accordinglyfwhen t e pump 22 isstopped, the check valve will open, permitting escape of this water.Thus, the lower end of this leg serves as a trap and while theconstruction illustrated is preferred, it

will be obvious that this trap may be placed at any point beyond the oatchamber from the centrifugal and in the connection between thecentrifugal and the riming pump.

Itwil1 be obvious that wit the structure above recited, in eventsomething, as for example, a leak at one of the joints ofthecentrifugal, interfered with the formation of working pressure in thecentrifugal, the cycle of operations would be continued indefinitely,subjecting the riming pump, centrifugal and the motors t ereof to aneedless wear and tear. AFor this reason, we have provided invcombination with the above` structure a means for limiting the numberof priming attempts which may be made in event the centrifugal pumpfails to generate proper pressure. This means may embody any of the wellknown try limiting switches commonly employed in safe-guardingelectrical appliances for a number of ears. In the present instance,this try limiting device embodies the usual ratchet wheel 73 havingassociated therewith a holding pawl 74 and an olperating pawl 75 bymeans pf which the rate etwheel 73 may beadvanced against acounterweight 76, which gives a bias to the ratchet wheel.

This operating pawl is carried by the end i. of the switch arm 58 of theswitch 16. The tail of the holding pawl 74 is arranged in the path ofthe switch element 72 so that as the piston 69 moves in response topressure within the centrifugal, this holding pawl is withdrawn. Theoperating pawl 75 -has a tail 77 coacting with a trip stop 77a againstwhich the tail engages upon sufli- 8" cient elevation of the arm 58 tocause release of the operating pawl. The normal movement of the arm 58is suicient to bring this tail into 'engagement with the stop 77a andwhen the piston 69 is operated under working pressure, the element 72 israis'ed so as to disengage the pawl 74 from holding the ratchet wheel 73and it will be obvious that the bias 76 will return the ratchet disk toits normal position. This ratchet disk has a pair of contact ins 78 and79 coacting with av tail 80 ormed upon the switch 29. After apredetermined number of steps of the ratchet disk, one of these stops 79engages the tail 80, shifting the 95 switch blade of the swit'ch' 29 sothat this blade is caused to disengage from the contact 28 and engage acontact 81, closing a circuitl82 having arranged thereln a signal 83which may be located at any convenient 1"" int and serve as anindication of trouble with the pump.

Since the system above describedv is operable by operation of thepriming pump alone, a signal will be given whether the W5 motor of themain pump is started or not, and accomplished during continual operationof the priming pump, by causing a pre- -determined number of ratchetsteps, as described heretofore. Thus, if the main motor Ul" circuit isbroken at one of the thermostatic switches 19 or at any point in theline, the system is automatically rendered inoperatlve and the signaloperated after a single starting of the vacuum pump. We have previouslymentioned the use of the magnetic clutch 12a and in Figure 2, we havediagrammatically indicated the circuit for operating the same at 86.This circuit includes spaced contacts 87 bridged b complete clollU sureof the motor starter w ich may be of any suitable character.

A n Figure 2, we have illustrated a modification of the structure, asregards the connections between the float chamber and the 12acentrifugal pump. In the structure above described, the ioat 43 issubjected to the pressure of the centrifugal while in operation and thisrenders it necessary that a rel atively heavy iioat be employed and likelim Asuction of the suction wise, where the pressure is extreme,necessitates the use of leverage for connecting the float and checkvalve. In the modification illustrated in this figure, a pressureOperated check valve 88 -is arranged immediately above the point ofcommunication of the conduit 70 with the conduit 36. Above this checkvalve, a sump return line 89 is connected and led to a suitable drain orto the sump. In this line, a check valve 90 is arranged opening towardthe sump. The check valve 90 will be closed and the valve 88 will beopen while the suction pump is acting to prime the centrifugal pump.When, however, the centrifugal pump is in operation and pressure isgenerated, this pressure will close the check 88, the line 89 relievingthe conduit 36 between the check 88 and the float valve to permit thecheck 88 to seat. The check 90 will then remain in open position untilthe water above the check 88 has been drained fromthe connection, thusallowing the float valve to open against the ump by its own weight andthe weight o the float. By this arrangement, the float is notsubjectedcontinuously to the pressure of the centrifugal and may be madeconsiderably lighter and at the same time properly perform its function.Furthermore, since relief of the conduit 36 insures against any pressurewhich will act with the vacuum of the vacuum pump to hold the ball valve45 against its seat, this structure with some slight modifications willpermit the cylinder 64 Aand its associated mechanism to bedispensedwith.- In this case, the arm of the valve 59 will be operateddirectly from the arm 54 instead of through the dash-pot connectionemployed in the structure previously described.

Since it is obvious that the structure hereinbefore set forth is, to agreat extent, merely illustrative and capable of a wide range of changeand modification without materially departing from the s irit of ourinvention, we do not limit ourse ves to such specific structure exceptas hereinafter claimed.

We claim l 1. In a pumping system, a centrifu al pump, a suction primingpump there or, means for starting the priming pump, suct-ion operatedmeans for starting the centrifugal pump, means for transferring thesuction of the priming pump to said means when the centrifugal pump isprimed, means for stopping the centrifugal pump after a predeterminedperiod of operation and means operated by the generation of operatingpressure in the centrifugal pump for rendering said stopping meansinoperative.

2. In a pumping system, a centrifu l pump, a suction priming pump thereor, means for starting the priming pump, suction operated means forstarting the centrifugal ump, means for transferring the suctlon o thepriming pump to said means when the centrifugal pump is primed, meansfor stopping the centrifugal pump after a predetermined period ofoperation, means operated by the generation of operating pressure in thecentrifugal pump for rendering said stopping means inoperative andstopping said priming pump.

3. In a pumping system, a centrifugal pump, a suction priming pumptherefor, means for starting the priming pump, suctFon operated meansfor starting the eentrifugal pump, means for transferring the suction ofthe priming pump to said means when the centrifugal pump is primed,means for stopping the centrifugal pump after a predetermined period of"operation, means operated by the generation of operating pressure inthe centrifugal pump for rendering said stopping means inoperative andstopping said priming pump and means automatically stopping thecentrifugal upon failure of the centrifugal pump to generate workingpressure during a predetermined number of starts.

4. A pump system comprising a centrifugal pump, an electrical motortherefor, a sucn tion pump for priming the centrifugal pump,

a switch controlling the operation of the motor, suction operated meansfor f' closing the switch, means for automatically connecting thesuction operated means to the suction pump upon completion of thepriming operation, means giving the switch bias normally maintaining theswitch in open position and returning the switch to open position at apredetermined interval after operation thereof by said suction operatedmeans and means responsive to operating pressure within the centrifugalpump for preventing opening of the switch by saidbias.

5. A pump system comprising a centrifugal pump, an electrical motortherefor, a suction pump for priming the centrifugal pump, a swltchcontrolling the operation of the motor, suction operated means forclosing the switch, meansA for automatically connecting the suctionoperated means to the suction pump upon completion of the primingoperation, means giving the switch bias normally maintaining the switchin open position and returning the switch to open position at apredetermined interval after operation thereof by said suction operatedmeans and means responsive to operatclosingthe switch, means forautomatically connecting the suction operated. means .to the suctionpump upon completion ofthe riming operation, means giving the switch`operations which may be had for said means for temporarily closing thecircuit of the motor -without an operation Aof the \last named means.

7. In a pumping system, a centrifugal pump, a suction priming pumptherefor, a connection between the centrifugal and priming pumpincluding a float, suction operated means for starting the centrifugalpump and. means operated by said' float cutting off communicationbetween the centrifugal and priming pump and opening communicationbetween said suction oper.- ated means andpriming pump when thecentrifugal is primed.

8. A pump system comprising a centrifugal pump and an electrical motortherefor and normally disconnected therefrom, a suction pump for primingthe centrifugal pump, a switch controlling the operation of the motor,means operated from the suction pump for closing said switch when. thecentrifugal pump is primed and means for automatically connecting thecentrifugal pump to the motor when the motor comes to operating speed. Y

9. In a pumping system, a centrifugal pump, a suction priming pumptherefor, a connection between the centrifugal pump and priming pumpincluding a ioat, suction operated means for starting the centrifugalpump, means o erated by said ioat cuttin oif communication between thecentrifuga pump and priming pump and opening communication between saidsuction operated means andpriming pump when the centrifugalpump isprimed, pressure operated means closing communication between thecentrifual pump and the float and means for draining that portion of theconnection lying between the float and the last named means afteroperation of the last named means.

10. A pump system comprising a centrifugal pump, an electrical motortherefor, a suction pump for priming the centrifugal pump, a switchcontrolling the operation of the motor, suction operated means fortemporaril closing said switch, means for automatically connecting saidsuction operated means to the suction pump upon completion of thepriming operation, means controlled b the generation of working pressureby tile centrifugal pump when started for mainsure within thecentrifugal pump for taining said switch in closedxposition, meansoperatively connected with the -switch for cutting olf' communicationbetween the suction pump andl said suction operated means as the switchis closed and means giving the switch Vbias opening the switch in apredetermined interval after operation of the last named means.

"11. A pump system comprising a' centrif' of the priming operation,means controlled bly the generation ofworking pressure by t ecentrifugal pump when started for maintaining said switch in closedposition,'means operative?l connected with the switch for cutting ocommunication between the suction pump and said suction operated meansas the-switch is closed and means giving the switch bias opening theswitch in a redetermined interval after operation of t e last namedmeans and means stopping the priming pump upon closure of theswitch apredetermined number of times without operation of the centrifugal pump.

l2. A pump .system comprising a main pump and a priming pump and anelectric motor for the main pump, a. float chamber in thek connectionbetween the priming pump and the main pump, a switch controllingoperation of the main pump motor, suction operated means for temporarilyclosing said switch, float operated means for cutting off communicationbetween the priming pump and the main pump and for placing the primingpump in communication with said suction operated means and means forrendering the closure of the switch permanent upon functioning of themain pump.

13. A pump system comprising a centrifugal pump, an electrical motortherefor, a. suction pump for priming the centrifugal pump, a switchcontrolling the operation of the motor, suction operated-means forclosing the switch, means for automatically connecting the suctionoperated means to the suction pump upon completion of the primingoperation2 means giving the switch bias normally maintaining the switchin open position and returning the switch too en position at apredetermined interval a er operation thereof by said suction operatedmeans, means responsive to operating pres- Venting opening of the switchby said ias and means controlled by closing of the switch cutting offcommunication between the suction operated means and the suction pumpfor an interval sufficient to permit said switch to open under theinfluence of its bias and the centrifugal pump to come to-a stop.

14. A pump system comprising a centrifugal pump, an electrical motortherefor, a suction` pump for priming the centrifugal pump, a switchcontrolling the operation of the motor, suction operated means forclosing the switch, means for automatically connecting the suctionoperated means to the suction pump upon completion of the primvingoperation, means giving the switch bias priming .pump therefor, meansautomatically starting the main pump When primed and stopping the mainpump in apredetermined interval upon failure of the pump to perform itsfunction, means controlling communication between the main and suctionpumps cutting off communication therebetween when the main pump isprimed and automatically re-establishing such communication upon failureof the main pump to start or perform its function after starting,

retarding means associated With the first named means and delaying itsfunction in i starting the pump after the pump has once been startedpreventing operation thereof until the ypump has come to a complete stopand means stopping the priming pump after a predetermined number ofoperations of said means controlling communication between the main andpriming pumps.

16. A'pump system comprising a centrifugal pump, an electrical motortherefor, a suction pump for priming the centrifugal pump, a switchcontrolling the operation of the motor, suction operated means fortemporarily closing said switch, means for automatically connecting saidsuction operated means to the suction pump upon completion of thepriming operation, means controlled by the generation of workingpressure by the centrifugal pump when started for maintaining saidswitch in closed position, means operatively connected with the switchfor cutting off communication between the suction pump and saidsuctionoperated means as the switch is closed, means giving the switch biasopening the switch in a predetermined interval after operation of thelast named means, means stopping the priming pump upon closure of theswitch a predetermined number of times without operation o f thecentrifugal, means giving said means bias cutting off communicationbetween the suction pump and suction operated means to -move the same toopen posit1on and re-establish such communication and means delaymgopcratlon of said means vuntil the bias of the switch has'opened theswitch and the centrifugal pump has come to a stop.

17. In a pumping system, a centrifugal pump, a suction priming pumptherefor, an

electric motor for the centrifugal pump, a

normally open circuit for the motor, Ameans for starting the primingpump', suction operated means for temporarily closing the circuit of thecentrifugal pump motor, means for transferring the suction of thepriming pump to said means when the centrifugal pump is primed, meansoperated by the suction operated mea-ns for closing communicationbetween the suction operated means and the priming pump and meansstopping the operation of the priming pump-upon failure of thecentrifugal pump to start or perform its functions after the circuit hasbeen closed a predetermined number of times.

18. In combination, a centrifugal pump, an electric motor for the pump,means for introducing a priming charge to the pump, a switch controllingthe pump motor, means f rendered operative by the introduction of apriming charge to the pump for closing the switch for an intervalnormally sufficient to permit the generation of working pressure in thepump and then tending to reopen the switch, means controlled by thegeneration of working pressure in the pump operatively engaging thefirst named means to prevent said means from opening the switch.

19. In combination, a centrifugal pump, an electric motor therefor, apriming pump for the. centrifugal pump, an electric motor for thepriming pump, a normally open switch controlling the centrifugal pumpmotor, means rendered operative by the introduction of a priming chargeto the centrifugal pump closing said switch for an nterval normallysuilicient to permit the generation of working pressure in thecentrifugal pump, means operated by the generation of working ressure inthe. centrifugal pump operative y engaging the rst named means toprevent said means from opening the switch, said means comprising aswitch opening the circuit of the priming pump motor under the influenceof working pressure in the centrifugal pump.

'20. In combination, a centrifugal pump, an electric motor for the pump,a circuit for the motor including a normally open switch, a controlcircuit for the switch likewise including a second normally open switch,means for introducing a priming charge to the pump, means renderedoperative by the introduction of a priming charge to the pump forclosing said second switch for an interval normally suficient to permitgenerallu tion of working pressure in the centrifugal pump and meanscontrolled by the generation of working pressure in the centrifugal pumpmaintaining said second switch in closed position.

21. A pump system comprising a'centrifugal pump, an electrical motortherefor, a suction pump for priming the centrifugal pump, a switchcontrolling the operation of the motor, suction operated means closingsaid switch, means operating 'independently of the centrifugal pump andat an interval after the closing of the switch normally suf ficient forthe generation of working pres-l sure in the pump tending to reopen theswitch in the absence of the generation of workin@ pressure inthecentrifugal pump, means For automatically connecting said suctionoperated means to the suction pump upon completion of the primingoperation and means controlled by the generation of working pressure inthe centrifugal pump when starting for maintaining said switch in closedosition.

22. pump system comprising a centrifugal pump, an electrical motortherefor, a suction pump for priming the centrifugal pump, a switchcontrolling the operation of the motor, suction operated means closingsaid switch, means operatin independently of' the. centrifugal pump anat an interval after the closing of the switch normally sufficient forthe generation of working pressure in the pump tendin to reopenv theswitch in the absence of t e generation of workin pressure in thecentrifugal pump, means or automatically connecting said suctionoperated means to the suction pump upon completion of the primingoperation, means controlled by the generation of Working pressure in thecentrifugal pump when starting for maintaining said switch in closedposition, and means operatively connected with the switch forcutting-ofi communication between said suction pump and said suctionoperated means as the switch` is closed.

In testimony whereof we hereunto aiix our signatures. v

CHARLES H. GoYNn. JOHN e. GoYNE. ALBERT F. GOYNE.

y JOHN H. DoUGHEnTY.

